Compound air-pump.



G. W. BALDWIN & P. H. STAPLVEY.`

COMPOUND AIR PUMP.

APPLICATION FILED MAY11.1914.

1,149,324. PatentedAug. 10, 1915.

commu. vLANoGRAvn cuw.\s|nNGToN, n, c.

@grains/r TEN@ Assmnons To THE con-STAPL'EY CONNECTICUT, AfCORPORATION rOF CONNIEC'IIOT.y

madam.

" Be it known that ive, GEORGE 'W'. BALDWIN and Pirnine H. S'nirilnr, both citizens of the United States, residing' at Bridgeport, 'county of Fairfield, State of Connecticut', have invented/'an kmprovenfient in COm pound Air-Pumps, of Whichthe following; is aspecifi'caltionl This "invention relates to single barrel, double acting,y compound "air pumps,

It is one of the y"objects yof the invention to produce an'y easy Working single barrel pump of this typejivhich shall be so constructeilas'to permit the barrel 'to be ma` terally 4shortened "Without appreciably increasing its diameteigfand Whieh shall retain 'the full e'fliciney `of' the llonger "barreled X further object :oftheinvention istokpro! duce a pump of this eharacter that rifvill take airy at the topA and thus permit the use of a A sheet metal basjeifhiehis impossible Where. air 'is talenatA the bottom. p

EWith theseand other ob'jects'in yView", We have devised the novel pump of Which the yfolloiiling deseriptionjinConnection with the accompanying drzwyi'ngy iS a specification, referencey oharaeter's being used to indicate the several `parts.` n

Figure 1 isa ifieii partly in elevation and partly in seeti'or' our novel pump,

A`the `parte .being in the position atrthe end of'a coinpletdown stroke; Fig. 2 a similar View on a reduced scale showingthe position of the `parts nearthe end of a completeup stroke, and Fig. Bis an elevatio'nof a piston AWasher detached.

This pump has `been devised yfor ai@ par-.

pose of meetingI a, requirement of the trade for ,a `fifteen-inoli4 single barrell'pump which shall be easy to ivorlgstrong 'and' durable and shall havehthe full eliiciency of the ordiiiar twenty-inchpump., y

` -denotes the' base iiiliich'lils blanked yout and' `formed from sheet metal', llther barrel, 12a pistontherein whichr 'is Carriedibi/ra 4piston tube 13 andl'fl a piston in the', piston tube Whi'ohlis eaiified afpiston rod `1.5 having a handle' 16. Thesheet metal base `77,1(Specification of Letterskfl'ratnt. .l applicati@ flied May 11, 1912.1.. serial Nbf'smso. Y

isproiided With a central unthreadedrllang'e y17 Whih receives the lower-end fthebarl rel,fwh1eh 1s a drawn tubeclosedat its lower end; Thebarrel is providedvwith a `ribilS lwhich "rests uponthe top ofthe lian-'ge `and isrigidly4 4secured tothe Lbase by upsetting the closed endofthe bar-rel afgainst'th'e under 'sildefof the base `on the innerfside of 'the e lower end ofthe fiange, asat 19, the ends of the flange being gripped between the rib i Ati the und the upset end of the barrel. upper end of thebarrelfis ahead QOcarry.` ing a hubQlfo'r ythe attachment of anozzlle,

not shown. The `hub is providedvwitli/ an air passage 22 1 communicating with 'a' eireular'; air space 23 Within the hub andproi- Lvided with a valve 24, Whichpermits air to pass outward freely? and is closed by? bask?. Ward pressure. The upper endof thebariel lhas threaded; engagement with the head vand chejoint is made @might by Hanging the edge ofthebarrel into a eircularfgroove 'inthe inner Wall of thehead. l

f'f .Nearfthe lower end'iof the piston tube'ris a rib Q6 'for `a purposel` presentlyto be 'explained. 327` denotes` a block which has threaded engagementy with the-'lower vend of the piston tube, 2,8 the flexible `Washerfof piston `12, 29 ametallie Washer lying; outside the flexible Washer, and 30e screw, 'pro'- vided with a longitudinal hole 3l through vthe l flexible fwasli'er ybetween the -metallic Washer and the'blockf. Tliemetallic Washer ispreferably provided-With a scalloped edge, as shown in Fig. 3, the diameter at the scallops fittingflooselyin the'ba'rrel soas to give firm" support to the flexible Washer in the upward movement and the depressions betWeen'pthe scallops permitting yair t lpass freely in thedo'wniifard movement. A sirnilarscallopedWasher-is preferably used in' stop adapted'for engagement'by` rib'jon the piston tube wilma tu@ @were mere.,

ment of said tube. Theupper end of thev `cap through piston tube isl Vclosedfbya which piston rod l5 slides. Airis admitted -to thepistontube through a holev86 in cap 35. Y

The operation. isas followsivOn the down stroke, air before piston 14 iscompressed in the piston tube and forced through holeBl in screw 30 into the barrel, whereitisagain compressed before piston 12 and-'passes said piston into the Vcircular airchamber 37 between the piston tube and the barrel, 'which communicates with air space 23 in the head, from whence the air passes out through hub 2l. Onrth'e up stroke, air passespiston Llei freely and compression is produced by piston 12 in air spaces 37 and 23. It` will be seen, therefore,V that there is a double compression orcompounding on the down stroke and a. single compression on the up stroke, both strokes effecting compression in air space-.37 and forcing air out through the Y* Y hub.

-i Having thus described our invention we claim: Vi

1.In a pump, the combination with a barrel and a tube forming an air space between said barrel and tube, of afdown strokepiston adapted'to reciprocate in the tube'and com'- press air in the space and an up stroke piston carried by the tube by Y which the air 1s j .further` compressedand forced outof the Pump'` Y y f I 2. In a pump, thejccmbination with abarrelv closed at its lower. end, of a sheet metal base `having afcentral yiiange to receive ther barrel, thebarrel 1being secured to the ibase by upsetting the closedv end Vofthe barrel against theunder side of the base atl the inner side of thelower. end of the flange.

3. In a pump, the combination with a bary rel provided near itslower end with a rib,

V5.5V Y

' tubeslidesand a flanged ringand 'packing Vwashers gripped between the head andthe of' a sheet metal `base having'a central flange which is engagedbythe rib, the closed end ofthebarrelbeing upset against the under side of the base at the inner sidejof the lower end of the flange, sothat the ends of the flange are gripped between thefrib and vtheupset end of the barreL v v5()` 4. InV a pump,A thecombmation with afbar- Y rel, a Vpiston in said barrel, a piston tube by which said piston is carried and which'is,

provided near its lowerV end with a rib, of a `head to whichthe barrel is secured, a clap` secured to the head through which the piston cap,1said.r1ngbeing adapted tov beV engaged by theY rib on the piston itube to limit the upward movement ofA the-tube. 5. In a pump, the combinationwith 1a barrelgclosed at its lower end,v a. piston in said ,barrel havingv a hole through and; a. piston the admission of air.

tube by which. said piston is carried, of a napump, the,combination*with abarrel and a head with which thebarrel has threaded-engagement and which is provided with a groove into which the upper en d of the barrel isflanged, of a piston carrying tube within the barrel, a cap through which said tube slides and which has threaded eni gagement withthe head,` ajpiston ycarrying rod in the piston tube and :a cap having Y threaded engagement with they tube through which said rod slides.

7. In a pump, the combination with a bare rel closed at its lower end, afpiston inthe barrel having a hole through'it and ak piston tube by which said piston is carried,y a circular air space beingfornied between `said tube and barrel,y of a pistonV in the tube, a

rod by which said piston is carried and a cap secured to the ytubey through which` the rod slides and which is provided with a hole for the admission of air, the piston inV the` tube forcing aii through the'piston'in the vbarrel and the latterpiston forcing air into vthe air 'spaceon the `l down stroke and the pistonin therbarrel compressing airin said space on the up stroke. y l 8. In a pump, the combinationwith a bar'- relr closed at its lower. end, anup stroke piston in the barrel'V having a holey through it V,and a piston tube by whichV said piston is carried, of a down stroke piston in said tube which forces air'through the pistonlinthe` i barrel on'the down stroke, the piston in the barrel compressing air'between the tubeand the barrel on the up stroke.v

e 9. In a pump, the combination with barrel closed at its lower end, a piston'V tube in said barrel, an up stroke piston comprising a block having threaded engagement withy the tube, a flexible washer and a screw lhaving a hole through it byl which the ywasher, is secured to the block, of a down stroke piston reciprocating in the tube, ya rodby which said second piston is carried anda cap ,ses

cured to Vthe tube through-which the rod,A

slides and whichis provided withia hole Vfor` l0. A pump for producing a double'colir pression` on the down stroke and a single compressionon thejup stroke, vcomprising a barrel, a tube forming an air space/between saidbarrel andtube and adaptedto reciprocate in thebarrel, a down `stroke piston adapted to reciprocate in the tube, andan stroke piston further compressing the air 1,149,324v o, #s

up stroke piston carried by the ytube and In testimony Whereofkwe aix our signai.

having ,a hole therethrough, the down stroke tures in presence of two Witnesses. piston compressing air in the tube and forc-y v 1 Y e ing it into thebarrel, andthe tube kand up and forcing it intothe air space from which Vitnesses: it is forced by the upward movement of the B. S. Con,

,up stroke piston. F. E. HATCH.

Gopies of this patentmay be obtained for fiver cents each, by addressingthe Commissioner of Patents,

' Washington, D. C. 

